Add sync error logging, extend error flash, fix unload saves

- Log workforce sync errors to backend stdout so they appear in docker logs
- Extend error flash from 5s to 15s so errors are readable
- Replace sendBeacon (POST-only) with keepalive fetch (PUT) on unload —
  sendBeacon was hitting 404s on all three unload saves

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/lucide-react/dist/esm/icons/tool-case.mjs

@@ -0,0 +1,37 @@
+/**
+ * @license lucide-react v1.24.0 - ISC
+ *
+ * This source code is licensed under the ISC license.
+ * See the LICENSE file in the root directory of this source tree.
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const __iconNode = [
+  ["path", { d: "M10 15h4", key: "192ueg" }],
+  [
+    "path",
+    {
+      d: "m14.817 10.995-.971-1.45 1.034-1.232a2 2 0 0 0-2.025-3.238l-1.82.364L9.91 3.885a2 2 0 0 0-3.625.748L6.141 6.55l-1.725.426a2 2 0 0 0-.19 3.756l.657.27",
+      key: "xbnumr"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "m18.822 10.995 2.26-5.38a1 1 0 0 0-.557-1.318L16.954 2.9a1 1 0 0 0-1.281.533l-.924 2.122",
+      key: "eaw7gc"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "M4 12.006A1 1 0 0 1 4.994 11H19a1 1 0 0 1 1 1v7a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2z",
+      key: "1vaooh"
+    }
+  ]
+];
+const ToolCase = createLucideIcon("tool-case", __iconNode);
+
+export { __iconNode, ToolCase as default };
+//# sourceMappingURL=tool-case.mjs.map